A CDMA mobile communications system and its random access control method and base station are provided that can reduce the probability of failing to detect the preamble. The method comprises preselecting positions on the foot with nerves at these positions to be stimulated and providing means for stimulating elevation of said insole at said preselected positions during step movement of said foot on said insole. Such conditions include central nervous system disorders such as generalized anxiety disorder, ADDADHD, neural injury, stroke, and migraine. The movable exit port may allow the tape to enter the housing along a line that is tangent to the coil of tape rotatably supported by the housing. Therefore, process yield can be improved, while production cost savings can be realized. The steering shaft actuator receives a second fluid pressure from the hydraulic pump, and applies a torque to the steering shaft by the second fluid pressure.